Table 2. Symptom profile of the cluster more representative of respiratory symptoms in each study.

Symptoms	Briggs29	Cox43	Bandelow44	Shioiri45	Rees46	Segui47	Neerakal48	Meuret5	Sarp50	Roberson-Nay7	Konkan51	Pattyn3	Drenckhan52	Bruno49
Shortness of breath/dyspnea	x	x	x	x	x	x	x	x	x	x	x	x	x	x
Choking/smothering sensations	x	x	x	x	x		x	x	x	x	x	x	x	x
Fear of dying	x	x	x					x	x	x		x
Chest pain/discomfort	x	x	x			x		x	x	x
Tingling/numbness/paresthesias	x		x			x		x	x	x
Palpitations/tachycardia		x				x		x	x	x		x
Dizziness										x
Flushes/chills				x
Trembling/shaking						x
Sweating				x
Faintness
Fear of losing control/going crazy											x	x
Nausea/abdominal discomfort				x							x
Depersonalization/derealization